Divestitures (CenterPoint Energy and CERC) - Summary of Discontinued Operations (Details) - USD ($) $ / shares in Units, $ in Millions	11 Months Ended	12 Months Ended
	Dec. 02, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Income tax expense		$ 0	$ 0	$ 201
Discontinued Operation, Alternative Cash Flow Information [Abstract]
Gain on Enable Merger		13	(303)	(681)
Equity in earnings (loss) of unconsolidated affiliates, net		0	0	(339)
Distributions from unconsolidated affiliates		0	0	155
Cash received related to Enable Merger		144	2,075	22
Operating revenues		8,696	9,321	8,352
Net income attributable to Enable Common Units		867	1,008	1,391
CERC Corp
Discontinued Operation, Alternative Cash Flow Information [Abstract]
Cash received related to Enable Merger		0	2,075	22
Natural gas expenses, including transportation and storage costs		0	115	0
Operating revenues		$ 4,149	$ 4,800	4,200
Discontinued Operations | Enable Midstream Partners
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Equity in earnings of unconsolidated affiliate, net				1,019
Income from discontinued operations before income taxes				1,019
Income tax expense				201
Net income from discontinued operations				818
Discontinued Operation, Alternative Cash Flow Information [Abstract]
Gain on Enable Merger	$ (680)			(681)
Equity in earnings (loss) of unconsolidated affiliates, net	(1,019)			(339)
Distributions from unconsolidated affiliates				155
Transaction costs related to the Enable Merger				(49)
Cash received related to Enable Merger				5
Cash Distribution				189
Natural gas expenses, including transportation and storage costs				85
Operating revenues	3,466
Cost of sales, excluding depreciation and amortization	1,959
Depreciation and amortization	382
Operating income	634
Net income attributable to Enable Common Units	461
CenterPoint Energy’s interest	248
Basis difference amortization	92
Loss on dilution, net of proportional basis difference recognition	$ (1)
Discontinued Operations | Enable Midstream Partners | CERC Corp
Discontinued Operation, Alternative Cash Flow Information [Abstract]
Natural gas expenses, including transportation and storage costs				$ 85
Discontinued Operations | Enable Midstream Partners | Enable Common Units
Discontinued Operation, Alternative Cash Flow Information [Abstract]
Distribution received (in dollars per unit)				$ 0.6610
Cash Distribution				$ 155
Discontinued Operations | Enable Midstream Partners | Enable Series A Preferred Units
Discontinued Operation, Alternative Cash Flow Information [Abstract]
Distribution received (in dollars per unit)				$ 2.2965
Cash Distribution				$ 34